Executives with the site confirmed to the newspaper that they are experimenting with the concept, but also that users on any platform can sort hotel search results to bring up other less expensive options.

"A lot of people won't look to think about that," D.C. resident Hakeem Sabur said. "They'll just think they're automatically getting the best price and they won't be."

Some, like Waldman, think that this kind of knowledge could lead him and others to take their booking business elsewhere.

"Your competition is one click away, and I'm going to start looking at other services available to me when I travel," he said.

One official told the Wall Street Journal that Mac users are also much more likely to book four and five-star hotels than PC customers.